Air filtration unit



FIG. 1 is a rear perspective view of an air filtration unit, showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a top plan view thereof. 

The ornamental design for an air filtration unit, as shown. 